U.S. patent application number 17/617483 was filed with the patent office on 2022-07-28 for terminal and radio communication method.
This patent application is currently assigned to NTT DOCOMO, INC.. The applicant listed for this patent is NTT DOCOMO, INC.. Invention is credited to Hiroki Harada, Xiaolin Hou, Yuki Matsumura, Satoshi Nagata, Lihui Wang, Shohei Yoshioka.
Application Number | 20220239442 17/617483 |
Document ID | / |
Family ID | |
Filed Date | 2022-07-28 |
United States Patent
Application |
20220239442 |
Kind Code |
A1 |
Yoshioka; Shohei ; et
al. |
July 28, 2022 |
TERMINAL AND RADIO COMMUNICATION METHOD
Abstract
An aspect of a terminal of the present disclosure includes a
control section that determines a first modulation order applied in
a first period and a second modulation order applied in a second
period, based on different pieces of information, and a receiving
section that receives a downlink channel, based on the first
modulation order or the second modulation order.
Inventors: |
Yoshioka; Shohei; (Tokyo,
JP) ; Matsumura; Yuki; (Tokyo, JP) ; Harada;
Hiroki; (Tokyo, JP) ; Nagata; Satoshi; (Tokyo,
JP) ; Wang; Lihui; (Beijing, CN) ; Hou;
Xiaolin; (Beijing, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NTT DOCOMO, INC. |
Tokyo |
|
JP |
|
|
Assignee: |
NTT DOCOMO, INC.
Tokyo
JP
|
Appl. No.: |
17/617483 |
Filed: |
June 11, 2019 |
PCT Filed: |
June 11, 2019 |
PCT NO: |
PCT/JP2019/023171 |
371 Date: |
December 8, 2021 |
International
Class: |
H04L 5/00 20060101
H04L005/00; H04W 52/26 20060101 H04W052/26 |
Claims
1. A terminal comprising: a control section that determines a first
modulation order applied in a first period and a second modulation
order applied in a second period, based on different pieces of
information; and a receiving section that receives a downlink
channel, based on the first modulation order or the second
modulation order.
2. The terminal according to claim 1, wherein the control section
determines the first modulation order, based on information defined
in specifications or information reported in system
information.
3. The terminal according to claim 1, wherein the control section
determines the second modulation order, based on information
reported by higher layer signaling.
4. The terminal according to claim 1, wherein the control section
determines a plurality of modulation orders as the second
modulation order according to a channel type applied.
5. The terminal according to claim 1, wherein the control section
determines the second modulation order, based on higher layer
signaling reporting a plurality of modulation order candidates, and
MAC control information specifying a particular modulation order
candidate or another parameter.
6. A radio communication method comprising: determining a first
modulation order applied in a first period and a second modulation
order applied in a second period, based on different pieces of
information; and receiving a downlink channel, based on the first
modulation order or the second modulation order.
7. The terminal according to claim 2, wherein the control section
determines the second modulation order, based on information
reported by higher layer signaling.
8. The terminal according to claim 2, wherein the control section
determines a plurality of modulation orders as the second
modulation order according to a channel type applied.
9. The terminal according to claim 3, wherein the control section
determines a plurality of modulation orders as the second
modulation order according to a channel type applied.
10. The terminal according to claim 2, wherein the control section
determines the second modulation order, based on higher layer
signaling reporting a plurality of modulation order candidates, and
MAC control information specifying a particular modulation order
candidate or another parameter.
11. The terminal according to claim 3, wherein the control section
determines the second modulation order, based on higher layer
signaling reporting a plurality of modulation order candidates, and
MAC control information specifying a particular modulation order
candidate or another parameter.
12. The terminal according to claim 4, wherein the control section
determines the second modulation order, based on higher layer
signaling reporting a plurality of modulation order candidates, and
MAC control information specifying a particular modulation order
candidate or another parameter.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to a terminal and a radio
communication method in next-generation mobile communication
systems.
BACKGROUND ART
[0002] In Universal Mobile Telecommunications System (UMTS)
network, the specifications of Long-Term Evolution (LTE) have been
drafted for the purpose of further increasing high speed data
rates, providing lower latency and so on (see Non-Patent Literature
1). In addition, for the purpose of further high capacity,
advancement and the like of the LTE (Third Generation Partnership
Project (3GPP) Release (Rel.) 8 and Rel. 9), the specifications of
LTE-Advanced (3GPP Rel. 10 to Rel. 14) have been drafted.
[0003] Successor systems of LTE (e.g., referred to as "5th
generation mobile communication system (5G))," "5G+(plus)," "New
Radio (NR)," "3GPP Rel. 15 (or later versions)," and so on) are
also under study.
CITATION LIST
Non-Patent Literature
[0004] Non-Patent Literature 1: 3GPP TS 36.300 V8.12.0 "Evolved
Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal
Terrestrial Radio Access Network (E-UTRAN); Overall description;
Stage 2 (Release 8)," April, 2010
SUMMARY OF INVENTION
Technical Problem
[0005] For future radio communication system (for example, NR Rel.
16 or later versions), studies have been conducted about
utilization of a frequency band or a frequency range (FR) higher
than a given frequency (for example, 52.6 GHz).
[0006] The frequency band higher than the given frequency is
expected to involve increased phase noise and high sensitivity to a
peak-to-average power ratio (PAPR).
[0007] However, no sufficient studies have been conducted about how
to perform communication control (for example, channel design,
modulation control, mapping control, and so on) at frequencies
higher than the given frequency.
[0008] Thus, an object of the present disclosure is to provide a
terminal and a radio communication method which can appropriately
perform communication even in a case where a high frequency band is
used.
Solution to Problem
[0009] A terminal according to an aspect of the present disclosure
includes: a control section that determines a first modulation
order applied in a first period and a second modulation order
applied in a second period, based on different pieces of
information; and a receiving section that receives a downlink
channel, based on the first modulation order or the second
modulation order.
Advantageous Effects of Invention
[0010] Thus, according to an aspect of the present disclosure,
communication can be appropriately performed even in a case where a
high frequency band is used.
BRIEF DESCRIPTION OF DRAWINGS
[0011] FIG. 1 is a diagram to show an example of an FR;
[0012] FIG. 2 is a diagram to show an example of control resource
set durations corresponding to subcarrier spacings.
[0013] FIGS. 3A to 3E are diagrams to show an example of allocation
of the control resource set;
[0014] FIGS. 4A to 4E are diagrams to show another example of
allocation of the control resource set;
[0015] FIGS. 5A to 5E are diagrams to show another example of
allocation of the control resource set.
[0016] FIGS. 6A and 6B are diagrams to show an example of
allocation of DMRSs;
[0017] FIG. 7 is a diagram to show an example of a configuration of
a TCI state in units of a given time;
[0018] FIG. 8 is a diagram to show an example of a method for
determining a modulation order for a plurality of durations;
[0019] FIGS. 9A to 9D are diagrams to show an example of allocation
of a PDCCH (or DMRS for the PDCCH);
[0020] FIG. 10 is diagram to show an example of allocation of a
control channel and a data channel;
[0021] FIG. 11 is a diagram to show an example of a schematic
structure of a radio communication system according to one
embodiment;
[0022] FIG. 12 is a diagram to show an example of a structure of a
base station according to one embodiment;
[0023] FIG. 13 is a diagram to show an example of a structure of a
user terminal according to one embodiment; and
[0024] FIG. 14 is a diagram to show an example of a hardware
structure of the base station and the user terminal according to
one embodiment.
DESCRIPTION OF EMBODIMENTS
(FR)
[0025] For NR, utilization of a frequency band up to 52.6 GHz has
been under study. For NR Rel. 16 or later versions, utilization of
a frequency band above 52.6 GHz has been under study. Note that the
frequency band may be rephrased as a frequency range (FR) as
appropriate.
[0026] FIG. 1 is a diagram to show an example of an FR. As shown in
FIG. 1, a target FR (FRx (x is an arbitrary character string)
ranges, for example, from 52.6 GHz to 114.25 GHz. Note that the
frequency range in NR includes FR1 from 410 MHz to 7.152 GHz and
FR2 from 24.25 GHz to 52.6 GHz.
[0027] A frequency band higher than 52.6 GHz is expected to involve
increased phase noise and increased propagation loss. The frequency
band higher than 52.6 GHz is expected to involve high sensitivity
to at least one of a peak-to-average power ratio (PAPR) and PA of
non-linearity.
[0028] With the above-described matter taken into account, a
configuration with a larger subcarrier spacing (for example, at
least one of CP-OFDM and DFT-S-OFDM) may be conceivable for a
frequency band above 52.6 GHz (or a waveform for the frequency band
above 52.6 GHz).
[0029] In Rel. 15, a DL channel (for example, the PDCCH) is
designed based on an OFDM waveform. However, for a frequency band
above 52.6 GHz, studies of channel design based on a single carrier
are expected.
[0030] The inventors of the present invention focused on a need for
communication control different from existing communication control
in a given frequency band (for example, a frequency band above 52.6
GHz), and came up with the present invention.
[0031] Embodiments according to the present invention will be
described in detail with reference to the drawings as follows. Note
that each of the following first to third aspects may be used
independently or at least two of the aspects may be combined for
application.
[0032] Note that the present embodiment may be applied to the
existing FR1 and FR2 as well as to the above-described FRx (for
example, a given frequency range above 52.6 GHz).
(First Aspect)
[0033] In a first aspect, resource allocation for downlink channel
will be described. Note that as the downlink channel, a downlink
control channel (for example, the PDCCH) will be described by way
of example but that the applicable downlink channel is not limited
to the PDCCH but may be another downlink channel (for example, a
PDSCH or the like). The first aspect may be applied to an uplink
channel (for example, a PUCCH, a PUSCH, or the like) as well as to
the downlink channel.
[0034] Allocations of a control resource set (controlResourceSet
(CORESET)) in a time domain direction, a frequency domain
direction, and a spatial domain direction, the CORESET being mapped
with a PDCCH, will each be described below. The allocation
directions in the respective domains may be employed independently
or at least two of the allocation directions may be employed in
combination.
<Time Domain>
[0035] A time domain resource allocation (TDRA) duration for a
control resource set may be determined based on at least one of a
unit shorter than a slot (for example, a sub-slot level or a
half-slot level) and a unit of given slots (for example, x-slot
level (X.gtoreq.1)). The slot may be constituted of a given number
of symbols.
[0036] For example, for a normal cyclic prefix (NCP), one slot may
be constituted of 14 symbols, and for an extended cyclic prefix
(ECP), one slot may be constituted of 12 symbols. Of course, the
number of symbols constituting the slot is not limited to
these.
[0037] FIG. 2 is a diagram to show an example of control resource
set durations (CORESET Durations) for respective subcarrier
spacings. FIG. 2 shows 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz,
480 kHz, 960 kHz, 1920 kHz, and 3840 kHz as examples of subcarrier
spacings. However, the durations may be defined for other
subcarrier spacings. Note that the numerical values shown in FIG. 2
are illustrative and that no such limitation is intended.
[0038] For example, up to a given subcarrier spacing, the maximum
value of the control resource set duration (or a region to which
the control resource set is allocated) may be a first value. In
this regard, in a case where the subcarrier spacing is 120 kHz or
lower (15 kHz, 30 kHz, 60 kHz, or 120 kHz), the first value may be
3 symbols. In other words, in a case where the subcarrier spacing
is equal to or less than 120 kHz, an allocation region for the
control resource set may be configured to 3 symbols or less (up to
3 symbols).
[0039] On the other hand, in a case where the subcarrier spacing is
greater than a given value (for example, 120 kHz), the maximum
value of the control resource set duration may be a second value
greater than the first value. For example, the second value may be
more than three symbols (for example, a subslot) or at least one of
a half slot, a slot, and a plurality of slots. In other words, in a
case where the subcarrier spacing is greater than 120 kHz, the
allocation region for the control resource set may be configured to
at least one of x symbols or less (for example, x>3), a half
slot or less, one slot or less, or a plurality of slots or
less.
[0040] In a case where the subcarrier spacing is 120 kHz or less,
the maximum value of the control resource set duration may be
configured in common. In a case where the subcarrier spacing is
greater than 120 kHz, the maximum value of the control resource set
duration may be configured separately for each subcarrier spacing
(or each of some subcarrier spacings). For example, the maximum
number of symbols or slots to which the control resource set can be
allocated may be configured to increase consistently with the
subcarrier spacing.
[0041] Thus, for a high frequency band with a large difference in
subcarrier spacing (for example, a frequency band above 52.6 GHz),
the allocation region for the control resource set (or the PDCCH)
can be flexibly configured according to the subcarrier spacing (or
the symbol length).
[0042] With a given subcarrier spacing, the PDCCH (or the control
resource set) is expected to be used in more than one slots. In
such a case, the same time domain resource allocation of the PDCCH
may be configured for a plurality of slots (or different slots).
Alternatively, the time domain resource allocation of the PDCCH may
be configured separately (for example, differently) for a plurality
of slots.
[0043] The time domain resource allocation of the PDCCH (or the
control resource set) may be configured consecutively or
inconsecutively in a slot. The time domain resource allocation of
the PDCCH (or the control resource set) may be configured
consecutively or inconsecutively in different slots (for example,
cross slots).
[0044] The control resource set may be allocated across the
boundary between given time units (or may cross the boundary)
(transmission method 1). The given time unit may be a slot.
Alternatively, the PDCCH may be repeated in given time units
(transmission method 2). The repetition of the PDCCH in slot units
may be referred to as PDCCH repetition with slot aggregation.
[0045] Which transmission method (also referred to as transmission
type or transmission mode) 1 or 2 is to be applied may be defined
in specifications or configured from a network (for example, a base
station) to a terminal by higher layer signaling or the like.
[0046] Application of beam cycling in given symbol (or given slot)
units may be supported. Information related to the unit of beam
cycling (for example, the number of symbols) may be reported from
the base station to the UE by higher layer signaling or may be
defined in specifications.
[0047] For example, the unit of beam cycling may be determined with
reference to the value (for example, .mu.) of a given subcarrier
spacing. As an example, the unit of beam cycling may be the number
of symbols obtained by 2.sup.(.mu./.mu.3). .mu. is the subcarrier
spacing at which the control resource set is transmitted, and .mu.3
(=3) may correspond to a subcarrier spacing of 120 kHz.
[0048] At each subcarrier spacing, a given number (for example, the
number of X symbols) of demodulation reference signals may be
time-multiplexed (TDM) with the PDCCH. The demodulation reference
signal may also be referred to as a demodulation reference signal
(DMRS) for the PDCCH. Information related to the number of symbols
to which the DMRS is allocated may be defined in specifications or
may be reported from the base station to the terminal by higher
layer signaling or the like.
[0049] The common number (for example, the same value) of symbols
to which the DMRS is allocated in given time units (for example,
slots) may be configured for a plurality of subcarrier spacings.
Alternatively, the number of symbols to which the DMRS is allocated
may be configured separately (for example, differently) for each
subcarrier spacing.
[0050] FIGS. 3A to 5E show an example of time domain allocation of
the control resource set (or the PDCCH). FIG. 3 shows a case in
which the resources allocated within one slot are consecutive.
FIGS. 4A to 4E show a case in which the resources allocated within
one slot are not consecutive (inconsecutive). FIGS. 5A to 5E show a
case in which the resources allocated within the first slot are
consecutive, whereas the resources allocated within the other slots
are inconsecutive.
[0051] The figures show that beam cycling (for example, switching
between beams #1 and #2 and #3) is applied in slot units. However,
the time units in which the beam cycling is applied, the number,
the beam indices for the beam cycling applied, and the like are not
limited to the configuration shown in FIGS. 3A to 5E. The same beam
may be applied in different slots.
[0052] In FIGS. 3A to 5E, FIG. 3A, FIG. 4A, and FIG. 5A show an
example of allocation (up to 3 symbols) of the control resource set
in a case where the subcarrier spacing is 120 kHz, and FIGS. 3B to
3E, FIGS. 4B to 4E, and FIGS. 5B to 5E show an example of
allocation of the control resource set in a case where the
subcarrier spacing is 1920 kHz. The figures show cases in which the
control resource set with a subcarrier spacing of 1920 kHz is
allocated in three slots. However, the number and positions of
slots in which the control resource set can be allocated are not
limited to the illustrated configuration.
[0053] FIG. 3B shows a case in which the same time domain resource
allocation (TDRA) is applied among different slots and in which
TDRAs are consecutive over a plurality of slots (or the TDRAs are
consecutive at least among different slots).
[0054] FIG. 3C shows a case in which the same TDRA is applied among
different slots and in which TDRAs are not consecutive over a
plurality of slots (for example, gaps occur in the control resource
set allocated to different slots). Gaps are provided in the control
resource set (or between the PDCCH resources) over a plurality of
slots to allow the time required for beam switching to be secured.
A UL section can be configured in the slot.
[0055] FIG. 3D shows a case in which different TDRAs are applied
among different slots and in which the TDRAs are consecutive over a
plurality of slots. In this case, in the leading slot and the last
slot to which the control resource set is allocated, some of the
symbols can be allocated with the control resource set. This allows
a UL section to be configured in the slot.
[0056] FIG. 3E shows a case in which different TDRAs are applied
among different slots and in which the TDRAs are not consecutive
over a plurality of slots (for example, gaps occur in the control
resource set allocated to different slots). Gaps are provided in
the control resource set (or between the PDCCH resources) over a
plurality of slots to allow the time required for beam switching to
be secured. The resource allocation region can be flexibly
configured in each slot, allowing a DL section or a UL section to
be flexibly configured.
[0057] FIGS. 4B to 4E show a case including a configuration in
which the resources allocated within at least one of a plurality of
slots in which the control resource set is allocated are not
consecutive (inconsecutive). The figures show a case in which the
same beam is applied to inconsecutive resources within one slot.
However, no such limitation is intended. For example, different
beams may be applied to inconsecutive resources within one
slot.
[0058] FIG. 4B shows a case in which the same TDRA is applied among
different slots and in which the TDRAs are consecutive (or cross)
over at least different slots. The control resource set is
inconsecutively configured within one slot (or gaps are provided)
to allow the time required for beam switching to be secured when
different beams are applied, for example. A UL section can be
configured in the slot.
[0059] FIG. 4C shows a case in which the same TDRA is applied among
different slots and in which TDRAs are not consecutive over a
plurality of slots (for example, gaps occur in the control resource
set allocated to different slots). Gaps are provided in the control
resource set (or between the PDCCH resources) over a plurality of
slots to allow the time required for beam switching to be secured.
A UL section can be configured in the slot.
[0060] FIG. 4D shows a case in which different TDRAs are applied
among different slots and in which the TDRAs are consecutive over a
plurality of slots. In this case, in the leading slot and the last
slot to which the control resource set is allocated, some of the
symbols can be allocated with the control resource set. This allows
a UL section to be configured in the slot.
[0061] FIG. 4E shows a case in which different TDRAs are applied
among different slots and in which the TDRAs are not consecutive
over a plurality of slots (for example, gaps occur in the control
resource set allocated to different slots). Gaps are provided in
the control resource set (or between the PDCCH resources) over a
plurality of slots to allow the time required for beam switching to
be secured. The resource allocation region can be flexibly
configured in each slot, allowing a DL section or a UL section to
be flexibly configured.
[0062] FIGS. 5B to 5E show a case including a configuration in
which the resources allocated within at least one of a plurality of
slots in which the control resource set is allocated are
consecutive. The figures show a case in which the resources are
consecutive at least in the leading slot in which the control
resource set is allocated. However, no such limitation is intended.
The figures show a case in which the same beam is applied to
inconsecutive resources within one slot. However, no such
limitation is intended. For example, different beams may be applied
to inconsecutive resources within one slot.
[0063] FIG. 5B shows a case in which the same TDRA is applied among
different slots (for example, the second and third slots) and in
which the TDRAs are consecutive at least between different slots
(TDRAs cross the boundary). The control resource set is
inconsecutively configured within one slot (or gaps are provided)
to allow the time required for beam switching to be secured when
different beams are applied, for example. A UL section can be
configured in the slot.
[0064] FIG. 5C shows a case in which the same TDRA is applied among
different slots (for example, the second and third slots) and in
which TDRAs are not consecutive over a plurality of slots (for
example, gaps occur in the control resource set allocated to
different slots). Gaps are provided in the control resource set (or
between the PDCCH resources) over a plurality of slots to allow the
time required for beam switching to be secured. A UL section can be
configured in the slot.
[0065] FIG. 5D shows a case in which different TDRAs are applied
among different slots and in which the TDRAs are consecutive over a
plurality of slots. In this case, the configuration can be such
that the control resource set is allocated to some of the symbols
in at least some of the slots. This allows a UL section to be
configured in the slot.
[0066] FIG. 5E shows a case in which different TDRAs are applied
among different slots and in which the TDRAs are not consecutive
over a plurality of slots (for example, gaps occur in the control
resource set allocated to different slots). Gaps are provided in
the control resource set (or between the PDCCH resources) over a
plurality of slots to allow the time required for beam switching to
be secured. The resource allocation region can be flexibly
configured in each slot, allowing a DL section or a UL section to
be flexibly configured.
[0067] In a case where the subcarrier spacing is greater than a
given value (for example, 120 kHz), the demodulation reference
signal (DMRS) and the PDCCH (or DCI) may be allocated separately
from each other in the time direction (for example, time
multiplexing) (see FIG. 6A). On the other hand, in a case where the
subcarrier spacing is equal to or less than the given value (for
example, 120 kHz), similarly to Rel. 15, the DMRS and the PDCCH (or
DCI) may be allocated separately from each other in the frequency
direction (for example, frequency multiplexing) (see FIG. 6B).
[0068] The number of symbols (for example, X) for the DMRS to be
time-multiplexed with the PDCCH (or DCI) may be defined in
specifications or may be reported from the base station to the UE
by higher layer signaling or the like. For each slot or for every
given number of slots, at least the DMRS allocated at the leading
position (also referred to as, for example, the front-loaded DMRS)
may be configured. FIG. 6A shows a case where at least one DMRS is
configured for the leading symbol of each slot.
[0069] One common DMRS may be used in a plurality of slots. The
number of symbols for the DMRS configured may be increased based on
the duration (for example, the number of symbols) to which the
control resource set is allocated, or the like. The DMRSs added
(additional DMRSs) may be configured for each slot or for every
given number of slots. Information related to the DMRSs added (for
example, the number and positions of DMRSs added and the like) may
be reported from the base station to the UE using at least one of
higher layer signaling and DCI.
<Frequency Domain>
[0070] Frequency domain resources in the control resource set may
be designed based on control channel elements (CCE) in given units
or an aggregation level (AL). For example, at least one of CCE and
AL may be configured as is the case with Rel. 15.
[0071] For example, one CCE may include a given number of (for
example, six) resource blocks (RB). In other words, the RBs
constituting one CCE may have a granularity of 6. The ALs supported
may be 1, 2, 4, 8, and 16 as is the case with Rel. 15. For example,
1CCE, 2CCE, 4CCE, 8CCE, and 16CCE may respectively correspond to
1AL, 2AL, 4AL, 8AL, and 16AL.
[0072] For example, for each subcarrier spacing (for example, 15
kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, 960 kHz, 1920 kHz,
and 3840 kHz), the common value of at least one of the number of
RBs constituting the CCE and the AL corresponding to the CCE may be
configured.
[0073] Alternatively, at least one of the number of RBs
constituting the CCE and the AL corresponding to the CCE at given
subcarrier spacings (for example, 240 kHz or more) may be
configured separately at the other subcarrier spacings (for
example, 120 kHz or less).
[0074] For example, the number of RBs constituting the CCE at a
given subcarrier spacing may be configured differently from (for
example, smaller than) the number of RBs constituting the CCE at
another subcarrier spacing. For example, the number of RBs
constituting 1CCE at a given subcarrier spacing may be less than 6
(for example, 2 or 3). By reducing the number of RBs constituting
the CCE in a case where the subcarrier spacing is increased,
adverse effects on usage can be reduced, allowing the configuration
of the terminal to be simplified.
[0075] Alternatively, the AL supported at a given subcarrier
spacing may be configured differently from (for example, higher
than) the AL supported at another subcarrier spacing. For example,
the ALs supported at a given subcarrier spacing may be 6, 10, 12,
18, 24, and 32. By increasing the ALs supported in a case where the
subcarrier spacing is increased, degradation of communication
quality can be suppressed. Of course, the ALs that can be supported
are not limited to these. AL1 may also be supported at the given
subcarrier spacing.
[0076] The types of mapping between CCE and REG (cce-REG-Mapping)
include interleave (or interleaving) and non-interleave (or
non-interleaving).
[0077] In a case where interleaving is applied, two REGs, three
REGs, or six REGs may be grouped to form an REG bundle to allow
interleaving to be performed in REG bundle units. Interleaving may
be performed within the CORESET. In a case where interleaving is
not applied, six REGs constituting one CCE form an REG bundle, and
the six REGs are consecutively allocated in the frequency direction
and/or time direction. In this case, one or more CCEs constituting
one PDCCH candidate may also be consecutively allocated in the
frequency direction.
[0078] The applicable type of mapping between CCE and REG may be
separately (for example, differently) configured for each
subcarrier spacing. For example, in a case where the subcarrier
spacing is equal to or less than a given value (for example, 120
kHz), as the type of mapping between CCE and REG, both interleave
and non-interleave are supported. Which type is to be used may be
reported from the base station to the UE by higher layer signaling
or the like.
[0079] In a case where the subcarrier spacing is greater than the
given value (for example, 120 kHz), as the type of mapping between
CCE and REG, only one of the types may be supported. The one of the
types may be non-interleave, for example. Thus, for single carrier
transmission (for example, in a case where DFT-s-OFDM is applied),
an increase in PAPR can be avoided.
[0080] In a case where the subcarrier spacing is greater than the
given value, frequency hopping for the control resource set (or the
PDCCH) may be supported. For example, at least one of intra-slot
frequency hopping (intro-slot FH) and inter-slot frequency hopping
(inter-slot FH) may be supported. The type of frequency hopping
supported may be defined in specifications or may be reported from
the base station to the UE by higher layer signaling or the like.
Different types of frequency hopping may be configured for the
respective subcarrier spacings.
[0081] For example, in a case where the frequency hopping is
supported, whether frequency hopping is configured or whether
frequency hopping is enabled/disabled may be reported from the base
station to the UE by higher layer signaling or the like.
[0082] A plurality of types of frequency hopping (for example,
intra-slot FH and inter-slot FH) may not be configured
simultaneously. In a case where two or more types of frequency
hopping are supported, the applied type of frequency hopping may be
reported from the base station to the UE by higher layer signaling
or the like.
[0083] In intra-slot FH, slot boundaries may be determined based on
the number of symbols in which the PDCCH is allocated. For example,
in a case where the number of symbols used for the PDCCH is N, a
ceiling function or a floor function may be applied to N/2
(ceil/floor(N/2)) to determine the slot boundaries.
[0084] An offset between frequency domains in frequency hopping
(for example, the offset between first hopping and second hopping)
may be reported from the base station to the UE by higher layer
signaling or the like. Alternatively, the offset may be defined in
specifications according to the size of the bandwidth.
<Spatial Domain>
[0085] For spatial domain resources in the control resource set, a
plurality of (for example, more than one) TCI states may be
configured. For example, the network may report, to the UE,
information related to the TCI state (for example, the number of
TCI states and so on) using higher layer parameters (for example,
tci-StatesPDCCH-ToAddList and so on).
[0086] In a case where the PDCCH is allocated in different slots
(or the PDCCH is transmitted by utilizing a plurality of slots)
(for example, FIGS. 3A to 5E), the same TCI state may be applied to
the PDCCH. Note that the slots may be interpreted as mini-slots,
half-slots, or a given number of symbols.
[0087] Alternatively, in a case where the PDCCH is allocated in
different slots (or the PDCCH is transmitted by using a plurality
of slots) (for example, FIGS. 3A to 5E), different TCI states may
be applied to the PDCCHs (see FIG. 7). FIG. 7 shows a case in which
different TCI states (in this case, TCI states #1 to #3) are
applied to the PDCCHs transmitted in slots (or mini-slots, half
slots, or a given number of symbols).
[0088] In a case where the number of TCI states (or TCI state
sequences or TCI state sets) configured by higher layer signaling
is greater than that on transmission occasions for the PDCCH, a
given TCI state may be activated (or updated) by using MAC CEs.
[0089] For example, it is assumed that three sets of TCI states
(three TCI state set) are configured by higher layer signaling (see
FIG. 7). Each set may include TCI states with the same index or
include TCI states with different indices. In this case, the base
station may specify a given TCI state set by using MAC CEs. FIG. 7
shows that TCI state set #1 is specified.
[0090] Alternatively, in a case where the base station recognizes
an optimum beam (or TCI state) for each slot (or mini-slot, half
slot, or the given number of symbols), the optimum beam may be
applied to all the slots. In such a case, the UE may assume that
one TCI state is reported (or activated or configured) for a
repetition of all PDCCHs.
[0091] In a case where the base station uses beam cycling to
transmit the PDCCH, a reception beam (or referred to as a reception
panel or a logical panel) for the UE used for reception of each
PDCCH may be any one of options 1 to 3 described below.
Option 1: the same reception beam is applied Option 2: different
reception beams are applied Option 3: a beam autonomously
determined by the UE is applied
[0092] In options 1 and 2, information related to the reception
beam applied by the UE may be specified by using at least one of
higher layer signaling and MAC CEs. In option 3, the reception beam
is selected on the UE side (UE implemented).
[0093] Note that for the reception beam (or reception panel) for
the UE, configuration, activation, or reporting of a panel ID may
be performed in addition to configuration, activation, or reporting
of the TCI state. Alternatively, for the reception beam (or
reception panel) for the UE, configuration, activation, or
reporting of the panel ID may be performed instead of
configuration, activation, or reporting of the TCI state.
[0094] For example, in a case where a given panel ID is configured,
activated, or reported, the UE may be required to receive DL
transmission (for example, at least one of the PDCCH, PDSCH,
CSI-RS, and PTRS (Phase Tracking Reference Signal)) by using a
panel corresponding to the panel ID. Note that the panel ID may be
interpreted as an antenna port group, a reference signal group (RS
group), a reception entity, a reception beam group (Rx beam group),
or a reception beam (Rx beam). The panel ID need not necessarily
correspond to the ID of a physical panel and may be a logical panel
ID.
(Second Aspect)
[0095] In a second aspect, a modulation scheme applied to a DL
channel (for example, a PDCCH) will be described. Note that the
modulation scheme will hereinafter be described that is applied to
the DL channel in a case where the subcarrier spacing is greater
than a given value (for example, 120 kHz) but that the modulation
scheme may be applied to a subcarrier spacing equal to or less than
the given value.
[0096] In modulation of the PDCCH, a plurality of modulation orders
may be supported. For example, in the modulation of the PDCCH, at
least one of BPSK, pi/2QPSK, and pi/2BPSK may be supported in
addition to QPSK.
[0097] Determination (or reporting) of the modulation order (or
modulation scheme) to be used for PDCCH transmission may be
controlled by different methods. The determination method for the
modulation order may be configured separately according to the
period of communication. For example, a first method may be used to
determine the modulation order applied to the PDCCH in the first
period, and a second method may be used to determine the modulation
order applied to the PDCCH in the second period (see FIG. 8).
[0098] Even for the same period (for example, the second period),
the determination method for the modulation order may be configured
separately based on a type or kind of the PDCCH (or DCI).
[0099] The first period may precede configuration (for example,
provision) of higher layer signaling (for example, dedicated RRC
signaling), and the second period may succeed the configuration of
the higher layer signaling. The modulation order used for PDCCH
transmission during the first period may be referred to as a
default modulation order, a first modulation order, and so on. Of
course, the first period and the second period are not limited to
the periods described above. In addition to the first period and
the second period, a third period may be provided.
<First Period>
[0100] For the first period, the modulation order used for PDCCH
transmission may be predefined in specifications. For example, the
modulation order used for PDCCH transmission during the first
period may be QPSK. In a case where the modulation order applied is
predefined in specifications, the reporting, to the UE, of
information regarding the modulation order can be omitted.
[0101] Alternatively, the modulation order used for PDCCH
transmission may be reported to the UE by using system information
(see FIG. 8). The system information may be SIBx (for example, SIB)
or MIB. In a case where the modulation order applied is reported
from the base station to the UE, the reporting, to the UE, of
information regarding the modulation order applied during the first
period can be omitted.
<Second Period>
[0102] For the second period, the modulation order used for PDCCH
transmission may be determined by using at least one of reporting
methods 1 to 4 described below.
[Reporting Method 1]
[0103] Information related to the modulation order may be reported
by using higher layer signaling (for example, RRC signaling). In
this case, the UE may determine at least one modulation order based
on the information included in the higher layer signaling reported
from the network (for example, the base station).
[Reporting Method 2]
[0104] The modulation order used for PDCCH transmission may be
determined separately based on the type or kind of the PDCCH (or
DCI). For example, a given method may be used to transmit
information related to the modulation order applied to the PDCCH
transmission transmitting UE-specific DCI, and another method may
be used to transmit information related to the modulation order
applied to the PDCCH transmission transmitting common DCI (or group
common DCI).
[0105] The given method may be reporting using higher layer
signaling. The UE may determine the modulation order applied to the
PDCCH for the UE-specific DCI based on the information included in
the higher layer signaling reported from the network.
[0106] Such another method may be reporting using higher layer
signaling or system information. The UE may determine the
modulation order applied to the PDCCH for common DCI based on the
information included in at least one of higher layer signaling and
system information reported from the base station. Note that in a
case where higher layer signaling is used to report the information
regarding the modulation order corresponding to the common DCI,
this information may be reported separately from the information
regarding the modulation order corresponding to the UE-specific DCI
(for example, by using a different RRC parameter).
[0107] Alternatively, the modulation order applied to the PDCCH
transmission transmitting the common DCI (or group common DCI) may
be predefined in specifications. In this case, the UE determines
the modulation order corresponding to the UE-specific DCI based on
the information from the base station, and the modulation order
corresponding to the common DCI based on the contents defined in
specifications.
[0108] Thus, the modulation order applied to the PDCCH is
determined separately based on the type or kind of the PDCCH (or
DCI), enabling the modulation order to be flexibly configured
according to the type of the PDCCH.
[Reporting Method 3]
[0109] Information related to the modulation order may be
determined by using higher layer signaling (for example, RRC
signaling) and MAC control information (for example, MAC CEs). For
example, a plurality of candidates for the modulation order (or
modulation order set) applied to the PDCCH transmission may be
configured by higher layer signaling, and a given modulation order
may be specified by using MAC CEs.
[0110] The UE may determine one modulation order based on the
information related to the plurality of modulation order candidates
included in the higher layer signaling reported from the base
station and the information included in the MAC CEs. In this case,
as the modulation order applied to the PDCCH scheduling the MAC CEs
the modulation order recognized by the UE in advance may be used.
For example, the modulation order may be the latest modulation
order specified by the MAC CEs or a predefined modulation order
(for example, a default modulation order).
[0111] Thus, the information related to the modulation order is
reported by using the MAC CEs, enabling the modulation order to be
flexibly changed for configuration.
[Reporting Method 4]
[0112] Information related to the modulation order may be reported
by using higher layer signaling (for example, RRC signaling) and
another information (side information). For example, a plurality of
candidates for the modulation order (or modulation order set)
applied to the PDCCH transmission may be configured by higher layer
signaling, and a given modulation order may be determined based on
another information.
[0113] Such another information may be at least one of a DCI
format, a search space type, the index of the control resource set,
an aggregation level, and a type of RNTI. For example, different
DCI formats (or different search space types, different indices of
the control resource set, different aggregation levels, and
different types of RNTI) may be associated with the respective
plurality of candidates for the modulation order configured by
higher layer signaling.
[0114] The UE may determine one modulation order based on the
information related to the plurality of modulation order candidates
included in the higher layer signaling reported from the base
station and such another information applied to the PDCCH
transmission.
[0115] Thus, the modulation order is determined based on such
another information, enabling the modulation order to be flexibly
changed for configuration.
(Third Aspect)
[0116] In a third aspect, an allocation method for the DL channel
(for example, the PDCCH) will be described. Note that allocation
may be interpreted as mapping or multiplexing. Multiplexing in the
description below may be at least one of multiplexing between
different UEs and multiplexing between different antenna ports.
[0117] The modulation scheme will hereinafter be described that is
applied to the DL channel in a case where the subcarrier spacing is
greater than a given value (for example, 120 kHz) but that the
modulation scheme may be applied to a subcarrier spacing equal to
or less than the given value.
[0118] At least one of comb, a cyclic shift, a time domain OCC, and
a frequency domain OCC may be applied to the allocation of the DL
channel. The comb may be referred to as a CDM group.
[0119] At least one of the comb, cyclic shift, time domain OCC, and
frequency domain OCC may be applied exclusively to the DMRS (for
example, DMRS for demodulating a PDCCH) used for demodulation of
the DL channel. In other words, the configuration may be such that
the comb, cyclic shift, time domain OCC, and frequency domain OCC
are not applied to the PDCCH (or DCI).
[0120] Alternatively, the configuration may be such that at least
one of the comb, cyclic shift, time domain OCC, and frequency
domain OCC are applied to both the DMRS for demodulation for the
PDCCH and the PDCCH (or DCI).
[0121] Information related to at least one of the comb, cyclic
shift, time domain OCC, and frequency domain OCC (for example, a
number applied and the like) may be reported from the base station
to the UE by higher layer signaling. The same DMRS configuration
may be configured for different slots or separate DMRS
configurations may be configured for the different slots.
[0122] FIG. 9A shows a case in which two combs and two cyclic
shifts, and a time domain OCC are applied. In this case, the DMRS
is allocated in two adjacent symbols, and thus an orthogonal code
in the time direction (for time division) (TD-OCC) may be used, in
addition to Comb and cyclic shift (CS). For example, up to eight
APs can be supported by using two types of Combs, two types of CSs,
and a TD-OCC ({1, 1} and {1-1}). Note that in this case, with the
TD-OCC ({1, 1} and {1-1}) not used, up to four APs may be
supported. Alternatively, instead of the TD-OCC, TDM may be
applied.
[0123] FIG. 9B shows a case where the frequency domain OCC and time
domain OCC are applied in units of adjacent REs. In this case, the
DMRS is allocated in two adjacent symbols, and thus up to 12 APs
can be supported by applying the orthogonal code to two resource
elements (REs) adjacent in the frequency direction (2-FD-OCC) and
applying the TD-OCC ({1, 1} and {1-1}) to two REs adjacent in the
time direction. Note that in this case, with the TD-OCC ({1, 1} and
{1-1}) not used, up to six APs may be supported. Alternatively,
instead of the TD-OCC, TDM may be applied.
[0124] FIG. 9C shows that two OCCs are applied in the frequency
direction (two frequency domain OCCs). FIG. 9D shows a case in
which 12 cyclic shifts and two OCCs in the time direction (two time
domain OCCs) are applied.
[0125] For example, multiplexing between the PDCCHs (for example,
multiplexing between the PDCCHs in different UEs) may be performed
based on comb (or different DCM groups). Furthermore, in a case
where a plurality of MIMO layers are supported for the PDCCH, at
least one of the cyclic shift, time domain OCC, and frequency
domain OCC may be applied to different layers of the PDCCH (or
different antenna ports). This appropriately enables multiplexing
between UEs and multiplexing between antenna ports.
[0126] In a case where the subcarrier spacing is greater than a
given value (for example, 120 kHz), application of hopping of a
DMRS sequence for PDCCH demodulation may be supported. The DMRS
sequence hopping may be controlled based on at least one of the
symbol level, slot level, and mini-slot level (or sub-slot
level).
[0127] For example, in a case where sequence hopping on the symbol
level is applied and the time domain OCC is applied to a plurality
of symbols for the DMRS, the same DMRS sequence may be applied to a
plurality of DMRS symbols within one time domain OCC. This enables
orthogonality of the time domain OCC to be maintained.
<Allocation of Control Channel and Data Channel>
[0128] At least one of frequency multiplexing (for example, FDM)
and time multiplexing (for example, TDM) may be applied to
allocation of a control channel (for example, the PDCCH) and a data
channel (for example, the PDSCH).
<Frequency Multiplexing>
[0129] In a case where the UE supports frequency multiplexing
between the PDCCH and the PDSCH, control may be performed such that
the PDCCH is allocated to a first allocation region (or resource),
whereas the PDSCH is allocated to a second allocation region. For
example, the first allocation region may be an edge region of a
cell, CC, or BWP, whereas the second allocation region may be an
inner side region of the cell, CC, or BWP.
[0130] For example, the PDSCH may be allocated such that the PDSCH
is sandwiched between the PDCCHs in the frequency direction (see
FIG. 10). This enables the PDSCH to be transmitted by using
consecutive resources.
[Time Multiplexing]
[0131] In a case where the UE supports the time multiplexing
between the PDCCH and the PDSCH, an interval between the PDCCH and
the PDSCH may be controlled based on UE capability. A time gap may
be provided between the PDCCH and the PDSCH. Provision of the time
gap allows suppression of an increase in processing load on the UE
in PDSCH buffering.
<Frequency Multiplexing/Time Multiplexing>
[0132] Both time multiplexing and frequency multiplexing may be
applied between the PDCCH and the PDSCH. Thus, the network (for
example, the base station) can flexibly control allocation of the
PDCCH and the PDSCH according to the UE capability, communication
conditions required, communication environments, and so on.
(Radio Communication System)
[0133] Hereinafter, a structure of a radio communication system
according to one embodiment of the present disclosure will be
described. In this radio communication system, the radio
communication method according to each embodiment of the present
disclosure described above may be used alone or may be used in
combination for communication.
[0134] FIG. 11 is a diagram to show an example of a schematic
structure of the radio communication system according to one
embodiment. The radio communication system 1 may be a system
implementing a communication using Long Term Evolution (LTE), 5th
generation mobile communication system New Radio (5G NR) and so on
the specifications of which have been drafted by Third Generation
Partnership Project (3GPP).
[0135] The radio communication system 1 may support dual
connectivity (multi-RAT dual connectivity (MR-DC)) between a
plurality of Radio Access Technologies (RATs). The MR-DC may
include dual connectivity (E-UTRA-NR Dual Connectivity (EN-DC))
between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))
and NR, dual connectivity (NR-E-UTRA Dual Connectivity (NE-DC))
between NR and LTE, and so on.
[0136] In EN-DC, a base station (eNB) of LTE (E-UTRA) is a master
node (MN), and a base station (gNB) of NR is a secondary node (SN).
In NE-DC, a base station (gNB) of NR is an MN, and a base station
(eNB) of LTE (E-UTRA) is an SN.
[0137] The radio communication system 1 may support dual
connectivity between a plurality of base stations in the same RAT
(for example, dual connectivity (NR-NR Dual Connectivity (NN-DC))
where both of an MN and an SN are base stations (gNB) of NR).
[0138] The radio communication system 1 may include a base station
11 that forms a macro cell C1 of a relatively wide coverage, and
base stations 12 (12a to 12c) that form small cells C2, which are
placed within the macro cell C1 and which are narrower than the
macro cell C1. The user terminal 20 may be located in at least one
cell. The arrangement, the number, and the like of each cell and
user terminal 20 are by no means limited to the aspect shown in the
diagram. Hereinafter, the base stations 11 and 12 will be
collectively referred to as "base stations 10," unless specified
otherwise.
[0139] The user terminal 20 may be connected to at least one of the
plurality of base stations 10. The user terminal 20 may use at
least one of carrier aggregation and dual connectivity (DC) using a
plurality of component carriers (CCs).
[0140] Each CC may be included in at least one of a first frequency
band (Frequency Range 1 (FR1)) and a second frequency band
(Frequency Range 2 (FR2)). The macro cell C1 may be included in
FR1, and the small cells C2 may be included in FR2. For example,
FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2
may be a frequency band which is higher than 24 GHz (above-24 GHz).
Note that frequency bands, definitions and so on of FR1 and FR2 are
by no means limited to these, and for example, FR1 may correspond
to a frequency band which is higher than FR2.
[0141] The user terminal 20 may communicate using at least one of
time division duplex (TDD) and frequency division duplex (FDD) in
each CC.
[0142] The plurality of base stations 10 may be connected by a
wired connection (for example, optical fiber in compliance with the
Common Public Radio Interface (CPRI), the X2 interface and so on)
or a wireless connection (for example, an NR communication). For
example, if an NR communication is used as a backhaul between the
base stations 11 and 12, the base station 11 corresponding to a
higher station may be referred to as an "Integrated Access Backhaul
(IAB) donor," and the base station 12 corresponding to a relay
station (relay) may be referred to as an "IAB node."
[0143] The base station 10 may be connected to a core network 30
through another base station 10 or directly. For example, the core
network 30 may include at least one of Evolved Packet Core (EPC),
5G Core Network (5GCN), Next Generation Core (NGC), and so on.
[0144] The user terminal 20 may be a terminal supporting at least
one of communication schemes such as LTE, LTE-A, 5G, and so on.
[0145] In the radio communication system 1, an orthogonal frequency
division multiplexing (OFDM)-based wireless access scheme may be
used. For example, in at least one of the downlink (DL) and the
uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier
Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division
Multiple Access (OFDMA), Single Carrier Frequency Division Multiple
Access (SC-FDMA), and so on may be used.
[0146] The wireless access scheme may be referred to as a
"waveform." Note that, in the radio communication system 1, another
wireless access scheme (for example, another single carrier
transmission scheme, another multi-carrier transmission scheme) may
be used for a wireless access scheme in the UL and the DL.
[0147] In the radio communication system 1, a downlink shared
channel (Physical Downlink Shared Channel (PDSCH)), which is used
by each user terminal 20 on a shared basis, a broadcast channel
(Physical Broadcast Channel (PBCH)), a downlink control channel
(Physical Downlink Control Channel (PDCCH)) and so on, may be used
as downlink channels.
[0148] In the radio communication system 1, an uplink shared
channel (Physical Uplink Shared Channel (PUSCH)), which is used by
each user terminal 20 on a shared basis, an uplink control channel
(Physical Uplink Control Channel (PUCCH)), a random access channel
(Physical Random Access Channel (PRACH)) and so on may be used as
uplink channels.
[0149] User data, higher layer control information, System
Information Blocks (SIBs) and so on are transmitted on the PDSCH.
User data, higher layer control information and so on may be
transmitted on the PUSCH. The Master Information Blocks (MIBs) may
be transmitted on the PBCH.
[0150] Lower layer control information may be transmitted on the
PDCCH. For example, the lower layer control information may include
downlink control information (DCI) including scheduling information
of at least one of the PDSCH and the PUSCH.
[0151] Note that DCI for scheduling the PDSCH may be referred to as
"DL assignment," "DL DCI," and so on, and DCI for scheduling the
PUSCH may be referred to as "UL grant," "UL DCI," and so on. Note
that the PDSCH may be interpreted as "DL data," and the PUSCH may
be interpreted as "UL data."
[0152] For detection of the PDCCH, a control resource set (CORESET)
and a search space may be used. The CORESET corresponds to a
resource to search DCI. The search space corresponds to a search
area and a search method of PDCCH candidates. One CORESET may be
associated with one or more search spaces. The UE may monitor a
CORESET associated with a given search space, based on search space
configuration.
[0153] One search space may correspond to a PDCCH candidate
corresponding to one or more aggregation levels. One or more search
spaces may be referred to as a "search space set." Note that a
"search space," a "search space set," a "search space
configuration," a "search space set configuration," a "CORESET," a
"CORESET configuration" and so on of the present disclosure may be
interchangeably interpreted.
[0154] Uplink control information (UCI) including at least one of
channel state information (CSI), transmission confirmation
information (for example, which may be also referred to as Hybrid
Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, and
so on), and scheduling request (SR) may be transmitted by means of
the PUCCH. By means of the PRACH, random access preambles for
establishing connections with cells may be transmitted.
[0155] Note that the downlink, the uplink, and so on in the present
disclosure may be expressed without a term of "link." In addition,
various channels may be expressed without adding "Physical" to the
head.
[0156] In the radio communication system 1, a synchronization
signal (SS), a downlink reference signal (DL-RS), and so on may be
transmitted. In the radio communication system 1, a cell-specific
reference signal (CRS), a channel state information-reference
signal (CSI-RS), a demodulation reference signal (DMRS), a
positioning reference signal (PRS), a phase tracking reference
signal (PTRS), and so on may be transmitted as the DL-RS.
[0157] For example, the synchronization signal may be at least one
of a primary synchronization signal (PSS) and a secondary
synchronization signal (SSS). A signal block including an SS (PSS,
SSS) and a PBCH (and a DMRS for a PBCH) may be referred to as an
"SS/PBCH block," an "SS Block (SSB)," and so on. Note that an SS,
an SSB, and so on may be also referred to as a "reference
signal."
[0158] In the radio communication system 1, a sounding reference
signal (SRS), a demodulation reference signal (DMRS), and so on may
be transmitted as an uplink reference signal (UL-RS). Note that
DMRS may be referred to as a "user terminal specific reference
signal (UE-specific Reference Signal)."
(Base Station)
[0159] FIG. 12 is a diagram to show an example of a structure of
the base station according to one embodiment. The base station 10
includes a control section 110, a transmitting/receiving section
120, transmitting/receiving antennas 130 and a transmission line
interface 140. Note that the base station 10 may include one or
more control sections 110, one or more transmitting/receiving
sections 120, one or more transmitting/receiving antennas 130, and
one or more transmission line interfaces 140.
[0160] Note that, the present example primarily shows functional
blocks that pertain to characteristic parts of the present
embodiment, and it is assumed that the base station 10 may include
other functional blocks that are necessary for radio communication
as well. Part of the processes of each section described below may
be omitted.
[0161] The control section 110 controls the whole of the base
station 10. The control section 110 can be constituted with a
controller, a control circuit, or the like described based on
general understanding of the technical field to which the present
disclosure pertains.
[0162] The control section 110 may control generation of signals,
scheduling (for example, resource allocation, mapping), and so on.
The control section 110 may control transmission and reception,
measurement and so on using the transmitting/receiving section 120,
the transmitting/receiving antennas 130, and the transmission line
interface 140. The control section 110 may generate data, control
information, a sequence and so on to transmit as a signal, and
forward the generated items to the transmitting/receiving section
120. The control section 110 may perform call processing (setting
up, releasing) for communication channels, manage the state of the
base station 10, and manage the radio resources.
[0163] The transmitting/receiving section 120 may include a
baseband section 121, a Radio Frequency (RF) section 122, and a
measurement section 123. The baseband section 121 may include a
transmission processing section 1211 and a reception processing
section 1212. The transmitting/receiving section 120 can be
constituted with a transmitter/receiver, an RF circuit, a baseband
circuit, a filter, a phase shifter, a measurement circuit, a
transmitting/receiving circuit, or the like described based on
general understanding of the technical field to which the present
disclosure pertains.
[0164] The transmitting/receiving section 120 may be structured as
a transmitting/receiving section in one entity, or may be
constituted with a transmitting section and a receiving section.
The transmitting section may be constituted with the transmission
processing section 1211, and the RF section 122. The receiving
section may be constituted with the reception processing section
1212, the RF section 122, and the measurement section 123.
[0165] The transmitting/receiving antennas 130 can be constituted
with antennas, for example, an array antenna, or the like described
based on general understanding of the technical field to which the
present disclosure pertains.
[0166] The transmitting/receiving section 120 may transmit the
above-described downlink channel, synchronization signal, downlink
reference signal, and so on. The transmitting/receiving section 120
may receive the above-described uplink channel, uplink reference
signal, and so on.
[0167] The transmitting/receiving section 120 may form at least one
of a transmission beam and a reception beam by using digital beam
forming (for example, precoding), analog beam forming (for example,
phase rotation), and so on.
[0168] The transmitting/receiving section 120 (transmission
processing section 1211) may perform the processing of the Packet
Data Convergence Protocol (PDCP) layer, the processing of the Radio
Link Control (RLC) layer (for example, RLC retransmission control),
the processing of the Medium Access Control (MAC) layer (for
example, HARQ retransmission control), and so on, for example, on
data and control information and so on acquired from the control
section 110, and may generate bit string to transmit.
[0169] The transmitting/receiving section 120 (transmission
processing section 1211) may perform transmission processing such
as channel coding (which may include error correction coding),
modulation, mapping, filtering, discrete Fourier transform (DFT)
processing (as necessary), inverse fast Fourier transform (IFFT)
processing, precoding, digital-to-analog conversion, and so on, on
the bit string to transmit, and output a baseband signal.
[0170] The transmitting/receiving section 120 (RF section 122) may
perform modulation to a radio frequency band, filtering,
amplification, and so on, on the baseband signal, and transmit the
signal of the radio frequency band through the
transmitting/receiving antennas 130.
[0171] On the other hand, the transmitting/receiving section 120
(RF section 122) may perform amplification, filtering, demodulation
to a baseband signal, and so on, on the signal of the radio
frequency band received by the transmitting/receiving antennas
130.
[0172] The transmitting/receiving section 120 (reception processing
section 1212) may apply reception processing such as analog-digital
conversion, fast Fourier transform (FFT) processing, inverse
discrete Fourier transform (IDFT) processing (as necessary),
filtering, de-mapping, demodulation, decoding (which may include
error correction decoding), MAC layer processing, the processing of
the RLC layer and the processing of the PDCP layer, and so on, on
the acquired baseband signal, and acquire user data, and so on.
[0173] The transmitting/receiving section 120 (measurement section
123) may perform the measurement related to the received signal.
For example, the measurement section 123 may perform Radio Resource
Management (RRM) measurement, Channel State Information (CSI)
measurement, and so on, based on the received signal. The
measurement section 123 may measure a received power (for example,
Reference Signal Received Power (RSRP)), a received quality (for
example, Reference Signal Received Quality (RSRQ), a Signal to
Interference plus Noise Ratio (SINR), a Signal to Noise Ratio
(SNR)), a signal strength (for example, Received Signal Strength
Indicator (RSSI)), channel information (for example, CSI), and so
on. The measurement results may be output to the control section
110.
[0174] The transmission line interface 140 may perform
transmission/reception (backhaul signaling) of a signal with an
apparatus included in the core network 30 or other base stations
10, and so on, and acquire or transmit user data (user plane data),
control plane data, and so on for the user terminal 20.
[0175] Note that the transmitting section and the receiving section
of the base station 10 in the present disclosure may be constituted
with at least one of the transmitting/receiving section 120, the
transmitting/receiving antennas 130, and the transmission line
interface 140.
[0176] Note that the transmitting/receiving section 120 may
transmit a control resource set for which the maximum value of at
least one of the number of symbols for allocation and the number of
slots for allocation is changed based on the subcarrier
spacing.
[0177] The transmitting/receiving section 120 may transmit at least
one of information related to the first modulation order applied in
the first period and information related to the second modulation
order applied in the second period.
[0178] The transmitting/receiving section 120 may transmit, in a
frequency band higher than a given frequency, a demodulation
reference signal for a downlink channel to which at least one of
the comb, cyclic shift, and OCC is applied.
[0179] The control section 110 controls transmission of the
downlink channel (for example, the PDCCH, PDSCH, or the like) in
the frequency band higher than the given frequency.
(User Terminal)
[0180] FIG. 13 is a diagram to show an example of a structure of
the user terminal according to one embodiment. The user terminal 20
includes a control section 210, a transmitting/receiving section
220, and transmitting/receiving antennas 230. Note that the user
terminal 20 may include one or more control sections 210, one or
more transmitting/receiving sections 220, and one or more
transmitting/receiving antennas 230.
[0181] Note that, the present example primarily shows functional
blocks that pertain to characteristic parts of the present
embodiment, and it is assumed that the user terminal 20 may include
other functional blocks that are necessary for radio communication
as well. Part of the processes of each section described below may
be omitted.
[0182] The control section 210 controls the whole of the user
terminal 20. The control section 210 can be constituted with a
controller, a control circuit, or the like described based on
general understanding of the technical field to which the present
disclosure pertains.
[0183] The control section 210 may control generation of signals,
mapping, and so on. The control section 210 may control
transmission/reception, measurement and so on using the
transmitting/receiving section 220, and the transmitting/receiving
antennas 230. The control section 210 generates data, control
information, a sequence and so on to transmit as a signal, and may
forward the generated items to the transmitting/receiving section
220.
[0184] The transmitting/receiving section 220 may include a
baseband section 221, an RF section 222, and a measurement section
223. The baseband section 221 may include a transmission processing
section 2211 and a reception processing section 2212. The
transmitting/receiving section 220 can be constituted with a
transmitter/receiver, an RF circuit, a baseband circuit, a filter,
a phase shifter, a measurement circuit, a transmitting/receiving
circuit, or the like described based on general understanding of
the technical field to which the present disclosure pertains.
[0185] The transmitting/receiving section 220 may be structured as
a transmitting/receiving section in one entity, or may be
constituted with a transmitting section and a receiving section.
The transmitting section may be constituted with the transmission
processing section 2211, and the RF section 222. The receiving
section may be constituted with the reception processing section
2212, the RF section 222, and the measurement section 223.
[0186] The transmitting/receiving antennas 230 can be constituted
with antennas, for example, an array antenna, or the like described
based on general understanding of the technical field to which the
present disclosure pertains.
[0187] The transmitting/receiving section 220 may receive the
above-described downlink channel, synchronization signal, downlink
reference signal, and so on. The transmitting/receiving section 220
may transmit the above-described uplink channel, uplink reference
signal, and so on.
[0188] The transmitting/receiving section 220 may form at least one
of a transmission beam and a reception beam by using digital beam
forming (for example, precoding), analog beam forming (for example,
phase rotation), and so on.
[0189] The transmitting/receiving section 220 (transmission
processing section 2211) may perform the processing of the PDCP
layer, the processing of the RLC layer (for example, RLC
retransmission control), the processing of the MAC layer (for
example, HARQ retransmission control), and so on, for example, on
data and control information and so on acquired from the control
section 210, and may generate bit string to transmit.
[0190] The transmitting/receiving section 220 (transmission
processing section 2211) may perform transmission processing such
as channel coding (which may include error correction coding),
modulation, mapping, filtering, DFT processing (as necessary), IFFT
processing, precoding, digital-to-analog conversion, and so on, on
the bit string to transmit, and output a baseband signal.
[0191] Note that, whether to apply DFT processing or not may be
based on the configuration of the transform precoding. The
transmitting/receiving section 220 (transmission processing section
2211) may perform, for a given channel (for example, PUSCH), the
DFT processing as the above-described transmission processing to
transmit the channel by using a DFT-s-OFDM waveform if transform
precoding is enabled, and otherwise, does not need to perform the
DFT processing as the above-described transmission process.
[0192] The transmitting/receiving section 220 (the RF section 222)
may perform modulation to a radio frequency band, filtering,
amplification, and so on, on the baseband signal, and transmit the
signal of the radio frequency band through the
transmitting/receiving antennas 230.
[0193] On the other hand, the transmitting/receiving section 220
(the RF section 222) may perform amplification, filtering,
demodulation to a baseband signal, and so on, on the signal of the
radio frequency band received by the transmitting/receiving
antennas 230.
[0194] The transmitting/receiving section 220 (reception processing
section 2212) may apply a receiving process such as analog-digital
conversion, FFT processing, IDFT processing (as necessary),
filtering, de-mapping, demodulation, decoding (which may include
error correction decoding), MAC layer processing, the processing of
the RLC layer and the processing of the PDCP layer, and so on, on
the acquired baseband signal, and acquire user data, and so on.
[0195] The transmitting/receiving section 220 (the measurement
section 223) may perform the measurement related to the received
signal. For example, the measurement section 223 may perform RRM
measurement, CSI measurement, and so on, based on the received
signal. The measurement section 223 may measure a received power
(for example, RSRP), a received quality (for example, RSRQ, SINR,
SNR), a signal strength (for example, RSSI), channel information
(for example, CSI), and so on. The measurement results may be
output to the control section 210.
[0196] Note that the transmitting section and the receiving section
of the user terminal 20 in the present disclosure may be
constituted with at least one of the transmitting/receiving section
220 and the transmitting/receiving antennas 230.
[0197] Note that the transmitting/receiving section 220 may receive
a control resource set for which the maximum value of at least one
of the number of symbols for allocation and the number of slots for
allocation is changed based on the subcarrier spacing and the
frequency band.
[0198] The transmitting/receiving section 220 may transmit at least
one of information related to the first modulation order applied in
the first period and information related to the second modulation
order applied in the second period. The transmitting/receiving
section 220 may receive a downlink channel based on at least one of
the received information related to the first modulation order and
the received information related to the second modulation
order.
[0199] The transmitting/receiving section 220 may receive, in a
frequency band higher than a given frequency, a demodulation
reference signal for a downlink channel to which at least one of
the comb-like subcarrier allocation (comb), cyclic shift, and
orthogonal cover code (OCC) is applied.
[0200] The control section 210 controls reception of the control
resource set. In a case where the subcarrier spacing is equal to or
less than a given value, the number of symbols in which the control
resource set is allocated has the same maximum value, and in a case
where the subcarrier spacing is greater than the given value, a
plurality of maximum values for the number of symbols in which the
control resource set is allocated may be configured according to
the subcarrier spacing. In a case where the control resource set is
allocated in a plurality of symbols, the allocation of the control
resource set may be configured separately for each slot. The number
of resource blocks constituting the control channel element in a
case where the subcarrier spacing is equal to or less than the
given value may be different from the number of resource blocks
constituting the control channel element in a case where the
subcarrier spacing is greater than the given value. In a case where
the control resource set is allocated in a plurality of symbols, a
transmission configuration indicator (TCI) applied to the
transmission of the control resource set may be configured
separately for each slot.
[0201] The control section 210 may determine the first modulation
order applied in the first period and the second modulation order
applied in the second period based on different pieces of
information. The control section 210 may determine the first
modulation order based on information defined in specifications or
information reported in the system information. The control section
210 may determine the second modulation order based on information
reported by higher layer signaling. The control section 210 may
determine a plurality of modulation orders as the second modulation
order depending on the channel type applied. The control section
210 may determine the second modulation order based on higher layer
signaling reporting a plurality of modulation order candidates, MAC
control information specifying a particular modulation order
candidate, or another parameter.
[0202] The control section 210 may control reception of the
downlink channel based on a demodulation reference signal and
information reported by higher layer signaling. At least one of
comb, a cyclic shift, and an OCC may be applied to the downlink
channel. At least one of the comb, cyclic shift, and OCC may be
applied to the demodulation reference signal. A sequence of
demodulation reference signals may be hopped at each given time
unit. The downlink channel may be a downlink control channel, the
downlink control channel may be allocated in a first region of a
partial bandwidth, and a downlink shared channel scheduled by the
downlink control channel may be allocated on a center side of the
partial bandwidth with respect to the first region.
(Hardware Structure)
[0203] Note that the block diagrams that have been used to describe
the above embodiments show blocks in functional units. These
functional blocks (components) may be implemented in arbitrary
combinations of at least one of hardware and software. Also, the
method for implementing each functional block is not particularly
limited. That is, each functional block may be realized by one
piece of apparatus that is physically or logically coupled, or may
be realized by directly or indirectly connecting two or more
physically or logically separate pieces of apparatus (for example,
via wire, wireless, or the like) and using these plurality of
pieces of apparatus. The functional blocks may be implemented by
combining softwares into the apparatus described above or the
plurality of apparatuses described above.
[0204] Here, functions include judgment, determination, decision,
calculation, computation, processing, derivation, investigation,
search, confirmation, reception, transmission, output, access,
resolution, selection, designation, establishment, comparison,
assumption, expectation, considering, broadcasting, notifying,
communicating, forwarding, configuring, reconfiguring, allocating
(mapping), assigning, and the like, but function are by no means
limited to these. For example, functional block (components) to
implement a function of transmission may be referred to as a
"transmitting section (transmitting unit)," a "transmitter," and
the like. The method for implementing each component is not
particularly limited as described above.
[0205] For example, a base station, a user terminal, and so on
according to one embodiment of the present disclosure may function
as a computer that executes the processes of the radio
communication method of the present disclosure. FIG. 14 is a
diagram to show an example of a hardware structure of the base
station and the user terminal according to one embodiment.
Physically, the above-described base station 10 and user terminal
20 may each be formed as computer an apparatus that includes a
processor 1001, a memory 1002, a storage 1003, a communication
apparatus 1004, an input apparatus 1005, an output apparatus 1006,
a bus 1007, and so on.
[0206] Note that in the present disclosure, the words such as an
apparatus, a circuit, a device, a section, a unit, and so on can be
interchangeably interpreted. The hardware structure of the base
station 10 and the user terminal 20 may be configured to include
one or more of apparatuses shown in the drawings, or may be
configured not to include part of apparatuses.
[0207] For example, although only one processor 1001 is shown, a
plurality of processors may be provided. Furthermore, processes may
be implemented with one processor or may be implemented at the same
time, in sequence, or in different manners with two or more
processors. Note that the processor 1001 may be implemented with
one or more chips.
[0208] Each function of the base station 10 and the user terminals
20 is implemented, for example, by allowing given software
(programs) to be read on hardware such as the processor 1001 and
the memory 1002, and by allowing the processor 1001 to perform
calculations to control communication via the communication
apparatus 1004 and control at least one of reading and writing of
data in the memory 1002 and the storage 1003.
[0209] The processor 1001 controls the whole computer by, for
example, running an operating system. The processor 1001 may be
configured with a central processing unit (CPU), which includes
interfaces with peripheral apparatus, control apparatus, computing
apparatus, a register, and so on. For example, at least part of the
above-described control section 110 (210), the
transmitting/receiving section 120 (220), and so on may be
implemented by the processor 1001.
[0210] Furthermore, the processor 1001 reads programs (program
codes), software modules, data, and so on from at least one of the
storage 1003 and the communication apparatus 1004, into the memory
1002, and executes various processes according to these. As for the
programs, programs to allow computers to execute at least part of
the operations of the above-described embodiments are used. For
example, the control section 110 (210) may be implemented by
control programs that are stored in the memory 1002 and that
operate on the processor 1001, and other functional blocks may be
implemented likewise.
[0211] The memory 1002 is a computer-readable recording medium, and
may be constituted with, for example, at least one of a Read Only
Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically
EPROM (EEPROM), a Random Access Memory (RAM), and other appropriate
storage media. The memory 1002 may be referred to as a "register,"
a "cache," a "main memory (primary storage apparatus)" and so on.
The memory 1002 can store executable programs (program codes),
software modules, and the like for implementing the radio
communication method according to one embodiment of the present
disclosure.
[0212] The storage 1003 is a computer-readable recording medium,
and may be constituted with, for example, at least one of a
flexible disk, a floppy (registered trademark) disk, a
magneto-optical disk (for example, a compact disc (Compact Disc ROM
(CD-ROM) and so on), a digital versatile disc, a Blu-ray
(registered trademark) disk), a removable disk, a hard disk drive,
a smart card, a flash memory device (for example, a card, a stick,
and a key drive), a magnetic stripe, a database, a server, and
other appropriate storage media. The storage 1003 may be referred
to as "secondary storage apparatus."
[0213] The communication apparatus 1004 is hardware
(transmitting/receiving device) for allowing inter-computer
communication via at least one of wired and wireless networks, and
may be referred to as, for example, a "network device," a "network
controller," a "network card," a "communication module," and so on.
The communication apparatus 1004 may be configured to include a
high frequency switch, a duplexer, a filter, a frequency
synthesizer, and so on in order to realize, for example, at least
one of frequency division duplex (FDD) and time division duplex
(TDD). For example, the above-described transmitting/receiving
section 120 (220), the transmitting/receiving antennas 130 (230),
and so on may be implemented by the communication apparatus 1004.
In the transmitting/receiving section 120 (220), the transmitting
section 120a (220a) and the receiving section 120b (220b) can be
implemented while being separated physically or logically.
[0214] The input apparatus 1005 is an input device that receives
input from the outside (for example, a keyboard, a mouse, a
microphone, a switch, a button, a sensor, and so on). The output
apparatus 1006 is an output device that allows sending output to
the outside (for example, a display, a speaker, a Light Emitting
Diode (LED) lamp, and so on). Note that the input apparatus 1005
and the output apparatus 1006 may be provided in an integrated
structure (for example, a touch panel).
[0215] Furthermore, these types of apparatus, including the
processor 1001, the memory 1002, and others, are connected by a bus
1007 for communicating information. The bus 1007 may be formed with
a single bus, or may be formed with buses that vary between pieces
of apparatus.
[0216] Also, the base station 10 and the user terminals 20 may be
structured to include hardware such as a microprocessor, a digital
signal processor (DSP), an Application Specific Integrated Circuit
(ASIC), a Programmable Logic Device (PLD), a Field Programmable
Gate Array (FPGA), and so on, and part or all of the functional
blocks may be implemented by the hardware. For example, the
processor 1001 may be implemented with at least one of these pieces
of hardware.
(Variations)
[0217] Note that the terminology described in the present
disclosure and the terminology that is needed to understand the
present disclosure may be replaced by other terms that convey the
same or similar meanings. For example, a "channel," a "symbol," and
a "signal" (or signaling) may be interchangeably interpreted. Also,
"signals" may be "messages." A reference signal may be abbreviated
as an "RS," and may be referred to as a "pilot," a "pilot signal,"
and so on, depending on which standard applies. Furthermore, a
"component carrier (CC)" may be referred to as a "cell," a
"frequency carrier," a "carrier frequency" and so on.
[0218] A radio frame may be constituted of one or a plurality of
periods (frames) in the time domain. Each of one or a plurality of
periods (frames) constituting a radio frame may be referred to as a
"subframe." Furthermore, a subframe may be constituted of one or a
plurality of slots in the time domain. A subframe may be a fixed
time length (for example, 1 ms) independent of numerology.
[0219] Here, numerology may be a communication parameter applied to
at least one of transmission and reception of a given signal or
channel. For example, numerology may indicate at least one of a
subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic
prefix length, a transmission time interval (TTI), the number of
symbols per TTI, a radio frame structure, a particular filter
processing performed by a transceiver in the frequency domain, a
particular windowing processing performed by a transceiver in the
time domain, and so on.
[0220] A slot may be constituted of one or a plurality of symbols
in the time domain (Orthogonal Frequency Division Multiplexing
(OFDM) symbols, Single Carrier Frequency Division Multiple Access
(SC-FDMA) symbols, and so on). Furthermore, a slot may be a time
unit based on numerology.
[0221] A slot may include a plurality of mini-slots. Each mini-slot
may be constituted of one or a plurality of symbols in the time
domain. A mini-slot may be referred to as a "sub-slot." A mini-slot
may be constituted of symbols less than the number of slots. A
PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot
may be referred to as "PDSCH (PUSCH) mapping type A." A PDSCH (or
PUSCH) transmitted using a mini-slot may be referred to as "PDSCH
(PUSCH) mapping type B."
[0222] A radio frame, a subframe, a slot, a mini-slot, and a symbol
all express time units in signal communication. A radio frame, a
subframe, a slot, a mini-slot, and a symbol may each be called by
other applicable terms. Note that time units such as a frame, a
subframe, a slot, mini-slot, and a symbol in the present disclosure
may be interchangeably interpreted.
[0223] For example, one subframe may be referred to as a "TTI," a
plurality of consecutive subframes may be referred to as a "TTI,"
or one slot or one mini-slot may be referred to as a "TTI." That
is, at least one of a subframe and a TTI may be a subframe (1 ms)
in existing LTE, may be a shorter period than 1 ms (for example, 1
to 13 symbols), or may be a longer period than 1 ms. Note that a
unit expressing TTI may be referred to as a "slot," a "mini-slot,"
and so on instead of a "subframe."
[0224] Here, a TTI refers to the minimum time unit of scheduling in
radio communication, for example. For example, in LTE systems, a
base station schedules the allocation of radio resources (such as a
frequency bandwidth and transmission power that are available for
each user terminal) for the user terminal in TTI units. Note that
the definition of TTIs is not limited to this.
[0225] TTIs may be transmission time units for channel-encoded data
packets (transport blocks), code blocks, or codewords, or may be
the unit of processing in scheduling, link adaptation, and so on.
Note that, when TTIs are given, the time interval (for example, the
number of symbols) to which transport blocks, code blocks,
codewords, or the like are actually mapped may be shorter than the
TTIs.
[0226] Note that, in the case where one slot or one mini-slot is
referred to as a TTI, one or more TTIs (that is, one or more slots
or one or more mini-slots) may be the minimum time unit of
scheduling. Furthermore, the number of slots (the number of
mini-slots) constituting the minimum time unit of the scheduling
may be controlled.
[0227] A TTI having a time length of 1 ms may be referred to as a
"normal TTI" (TTI in 3GPP Rel. 8 to Rel. 12), a "long TTI," a
"normal subframe," a "long subframe," a "slot" and so on. A TTI
that is shorter than a normal TTI may be referred to as a
"shortened TTI," a "short TTI," a "partial or fractional TTI," a
"shortened subframe," a "short subframe," a "mini-slot," a
"sub-slot," a "slot" and so on.
[0228] Note that a long TTI (for example, a normal TTI, a subframe,
and so on) may be interpreted as a TTI having a time length
exceeding 1 ms, and a short TTI (for example, a shortened TTI and
so on) may be interpreted as a TTI having a TTI length shorter than
the TTI length of a long TTI and equal to or longer than 1 ms.
[0229] A resource block (RB) is the unit of resource allocation in
the time domain and the frequency domain, and may include one or a
plurality of consecutive subcarriers in the frequency domain. The
number of subcarriers included in an RB may be the same regardless
of numerology, and, for example, may be 12. The number of
subcarriers included in an RB may be determined based on
numerology.
[0230] Also, an RB may include one or a plurality of symbols in the
time domain, and may be one slot, one mini-slot, one subframe, or
one TTI in length. One TTI, one subframe, and so on each may be
constituted of one or a plurality of resource blocks.
[0231] Note that one or a plurality of RBs may be referred to as a
"physical resource block (Physical RB (PRB))," a "sub-carrier group
(SCG)," a "resource element group (REG)," a "PRB pair," an "RB
pair" and so on.
[0232] Furthermore, a resource block may be constituted of one or a
plurality of resource elements (REs). For example, one RE may
correspond to a radio resource field of one subcarrier and one
symbol.
[0233] A bandwidth part (BWP) (which may be referred to as a
"partial bandwidth," and so on) may represent a subset of
contiguous common resource blocks (common RBs) for certain
numerology in a certain carrier. Here, a common RB may be specified
by an index of the RB based on the common reference point of the
carrier. A PRB may be defined by a certain BWP and may be numbered
in the BWP.
[0234] The BWP may include a UL BWP (BWP for the UL) and a DL BWP
(BWP for the DL). One or a plurality of BWPs may be configured in
one carrier for a UE.
[0235] At least one of configured BWPs may be active, and a UE does
not need to assume to transmit/receive a given signal/channel
outside active BWPs. Note that a "cell," a "carrier," and so on in
the present disclosure may be interpreted as a "BWP."
[0236] Note that the above-described structures of radio frames,
subframes, slots, mini-slots, symbols, and so on are merely
examples. For example, structures such as the number of subframes
included in a radio frame, the number of slots per subframe or
radio frame, the number of mini-slots included in a slot, the
numbers of symbols and RBs included in a slot or a mini-slot, the
number of subcarriers included in an RB, the number of symbols in a
TTI, the symbol length, the cyclic prefix (CP) length, and so on
can be variously changed.
[0237] Also, the information, parameters, and so on described in
the present disclosure may be represented in absolute values or in
relative values with respect to given values, or may be represented
in another corresponding information. For example, radio resources
may be indicated by given indices.
[0238] The names used for parameters and so on in the present
disclosure are in no respect limiting. Furthermore, mathematical
expressions that use these parameters, and so on may be different
from those expressly disclosed in the present disclosure. For
example, since various channels (PUCCH, PDCCH, and so on) and
information elements can be identified by any suitable names, the
various names allocated to these various channels and information
elements are in no respect limiting.
[0239] The information, signals, and so on described in the present
disclosure may be represented by using any of a variety of
different technologies. For example, data, instructions, commands,
information, signals, bits, symbols, chips, and so on, all of which
may be referenced throughout the herein-contained description, may
be represented by voltages, currents, electromagnetic waves,
magnetic fields or particles, optical fields or photons, or any
combination of these.
[0240] Also, information, signals, and so on can be output in at
least one of from higher layers to lower layers and from lower
layers to higher layers. Information, signals, and so on may be
input and/or output via a plurality of network nodes.
[0241] The information, signals, and so on that are input and/or
output may be stored in a specific location (for example, a memory)
or may be managed by using a management table. The information,
signals, and so on to be input and/or output can be overwritten,
updated, or appended. The information, signals, and so on that are
output may be deleted. The information, signals, and so on that are
input may be transmitted to another apparatus.
[0242] Reporting of information is by no means limited to the
aspects/embodiments described in the present disclosure, and other
methods may be used as well. For example, reporting of information
in the present disclosure may be implemented by using physical
layer signaling (for example, downlink control information (DCI),
uplink control information (UCI), higher layer signaling (for
example, Radio Resource Control (RRC) signaling, broadcast
information (master information block (MIB), system information
blocks (SIBs), and so on), Medium Access Control (MAC) signaling
and so on), and other signals or combinations of these.
[0243] Note that physical layer signaling may be referred to as
"Layer 1/Layer 2 (L1/L2) control information (L1/L2 control
signals)," "L1 control information (L1 control signal)," and so on.
Also, RRC signaling may be referred to as an "RRC message," and can
be, for example, an RRC connection setup message, an RRC connection
reconfiguration message, and so on. Also, MAC signaling may be
reported using, for example, MAC control elements (MAC CEs).
[0244] Also, reporting of given information (for example, reporting
of "X holds") does not necessarily have to be reported explicitly,
and can be reported implicitly (by, for example, not reporting this
given information or reporting another piece of information).
[0245] Determinations may be made in values represented by one bit
(0 or 1), may be made in Boolean values that represent true or
false, or may be made by comparing numerical values (for example,
comparison against a given value).
[0246] Software, whether referred to as "software," "firmware,"
"middleware," "microcode," or "hardware description language," or
called by other terms, should be interpreted broadly to mean
instructions, instruction sets, code, code segments, program codes,
programs, subprograms, software modules, applications, software
applications, software packages, routines, subroutines, objects,
executable files, execution threads, procedures, functions, and so
on.
[0247] Also, software, commands, information, and so on may be
transmitted and received via communication media. For example, when
software is transmitted from a website, a server, or other remote
sources by using at least one of wired technologies (coaxial
cables, optical fiber cables, twisted-pair cables, digital
subscriber lines (DSL), and so on) and wireless technologies
(infrared radiation, microwaves, and so on), at least one of these
wired technologies and wireless technologies are also included in
the definition of communication media.
[0248] The terms "system" and "network" used in the present
disclosure can be used interchangeably. The "network" may mean an
apparatus (for example, a base station) included in the
network.
[0249] In the present disclosure, the terms such as "precoding," a
"precoder," a "weight (precoding weight)," "quasi-co-location
(QCL)," a "Transmission Configuration Indication state (TCI
state)," a "spatial relation," a "spatial domain filter," a
"transmission power," "phase rotation," an "antenna port," an
"antenna port group," a "layer," "the number of layers," a "rank,"
a "resource," a "resource set," a "resource group," a "beam," a
"beam width," a "beam angular degree," an "antenna," an "antenna
element," a "panel," and so on can be used interchangeably.
[0250] In the present disclosure, the terms such as a "base station
(BS)," a "radio base station," a "fixed station," a "NodeB," an
"eNB (eNodeB)," a "gNB (gNodeB)," an "access point," a
"transmission point (TP)," a "reception point (RP)," a
"transmission/reception point (TRP)," a "panel," a "cell," a
"sector," a "cell group," a "carrier," a "component carrier," and
so on can be used interchangeably. The base station may be referred
to as the terms such as a "macro cell," a small cell," a "femto
cell," a "pico cell," and so on.
[0251] A base station can accommodate one or a plurality of (for
example, three) cells. When a base station accommodates a plurality
of cells, the entire coverage area of the base station can be
partitioned into multiple smaller areas, and each smaller area can
provide communication services through base station subsystems (for
example, indoor small base stations (Remote Radio Heads (RRHs))).
The term "cell" or "sector" refers to part of or the entire
coverage area of at least one of a base station and a base station
subsystem that provides communication services within this
coverage.
[0252] In the present disclosure, the terms "mobile station (MS),"
"user terminal," "user equipment (UE)," and "terminal" may be used
interchangeably.
[0253] A mobile station may be referred to as a "subscriber
station," "mobile unit," "subscriber unit," "wireless unit,"
"remote unit," "mobile device," "wireless device," "wireless
communication device," "remote device," "mobile subscriber
station," "access terminal," "mobile terminal," "wireless
terminal," "remote terminal," "handset," "user agent," "mobile
client," "client," or some other appropriate terms in some
cases.
[0254] At least one of a base station and a mobile station may be
referred to as a "transmitting apparatus," a "receiving apparatus,"
a "radio communication apparatus," and so on. Note that at least
one of a base station and a mobile station may be device mounted on
a moving object or a moving object itself, and so on. The moving
object may be a vehicle (for example, a car, an airplane, and the
like), may be a moving object which moves unmanned (for example, a
drone, an automatic operation car, and the like), or may be a robot
(a manned type or unmanned type). Note that at least one of a base
station and a mobile station also includes an apparatus which does
not necessarily move during communication operation. For example,
at least one of a base station and a mobile station may be an
Internet of Things (IoT) device such as a sensor, and the like.
[0255] Furthermore, the base station in the present disclosure may
be interpreted as a user terminal. For example, each
aspect/embodiment of the present disclosure may be applied to the
structure that replaces a communication between a base station and
a user terminal with a communication between a plurality of user
terminals (for example, which may be referred to as
"Device-to-Device (D2D)," "Vehicle-to-Everything (V2X)," and the
like). In this case, user terminals 20 may have the functions of
the base stations 10 described above. The words "uplink" and
"downlink" may be interpreted as the words corresponding to the
terminal-to-terminal communication (for example, "side"). For
example, an uplink channel, a downlink channel and so on may be
interpreted as a side channel.
[0256] Likewise, the user terminal in the present disclosure may be
interpreted as base station. In this case, the base station 10 may
have the functions of the user terminal 20 described above.
[0257] Actions which have been described in the present disclosure
to be performed by a base station may, in some cases, be performed
by upper nodes. In a network including one or a plurality of
network nodes with base stations, it is clear that various
operations that are performed to communicate with terminals can be
performed by base stations, one or more network nodes (for example,
Mobility Management Entities (MMEs), Serving-Gateways (S-GWs), and
so on may be possible, but these are not limiting) other than base
stations, or combinations of these.
[0258] The aspects/embodiments illustrated in the present
disclosure may be used individually or in combinations, which may
be switched depending on the mode of implementation. The order of
processes, sequences, flowcharts, and so on that have been used to
describe the aspects/embodiments in the present disclosure may be
re-ordered as long as inconsistencies do not arise. For example,
although various methods have been illustrated in the present
disclosure with various components of steps in exemplary orders,
the specific orders that are illustrated herein are by no means
limiting.
[0259] The aspects/embodiments illustrated in the present
disclosure may be applied to Long Term Evolution (LTE),
LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced,
4th generation mobile communication system (4G), 5th generation
mobile communication system (5G), Future Radio Access (FRA),
New-Radio Access Technology (RAT), New Radio (NR), New radio access
(NX), Future generation radio access (FX), Global System for Mobile
communications (GSM (registered trademark)), CDMA 2000, Ultra
Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)),
IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20,
Ultra-WideBand (UWB), Bluetooth (registered trademark), systems
that use other adequate radio communication methods and
next-generation systems that are enhanced based on these. A
plurality of systems may be combined (for example, a combination of
LTE or LTE-A and 5G, and the like) and applied.
[0260] The phrase "based on" (or "on the basis of") as used in the
present disclosure does not mean "based only on" (or "only on the
basis of"), unless otherwise specified. In other words, the phrase
"based on" (or "on the basis of") means both "based only on" and
"based at least on" ("only on the basis of" and "at least on the
basis of").
[0261] Reference to elements with designations such as "first,"
"second," and so on as used in the present disclosure does not
generally limit the quantity or order of these elements. These
designations may be used in the present disclosure only for
convenience, as a method for distinguishing between two or more
elements. Thus, reference to the first and second elements does not
imply that only two elements may be employed, or that the first
element must precede the second element in some way.
[0262] The term "judging (determining)" as in the present
disclosure herein may encompass a wide variety of actions. For
example, "judging (determining)" may be interpreted to mean making
"judgments (determinations)" about judging, calculating, computing,
processing, deriving, investigating, looking up, search and inquiry
(for example, searching a table, a database, or some other data
structures), ascertaining, and so on.
[0263] Furthermore, "judging (determining)" may be interpreted to
mean making "judgments (determinations)" about receiving (for
example, receiving information), transmitting (for example,
transmitting information), input, output, accessing (for example,
accessing data in a memory), and so on.
[0264] In addition, "judging (determining)" as used herein may be
interpreted to mean making "judgments (determinations)" about
resolving, selecting, choosing, establishing, comparing, and so on.
In other words, "judging (determining)" may be interpreted to mean
making "judgments (determinations)" about some action.
[0265] In addition, "judging (determining)" may be interpreted as
"assuming," "expecting," "considering," and the like.
[0266] The terms "connected" and "coupled," or any variation of
these terms as used in the present disclosure mean all direct or
indirect connections or coupling between two or more elements, and
may include the presence of one or more intermediate elements
between two elements that are "connected" or "coupled" to each
other. The coupling or connection between the elements may be
physical, logical, or a combination thereof. For example,
"connection" may be interpreted as "access."
[0267] In the present disclosure, when two elements are connected,
the two elements may be considered "connected" or "coupled" to each
other by using one or more electrical wires, cables and printed
electrical connections, and, as some non-limiting and non-inclusive
examples, by using electromagnetic energy having wavelengths in
radio frequency regions, microwave regions, (both visible and
invisible) optical regions, or the like.
[0268] In the present disclosure, the phrase "A and B are
different" may mean that "A and B are different from each other."
Note that the phrase may mean that "A and B is each different from
C." The terms "separate," "be coupled," and so on may be
interpreted similarly to "different."
[0269] When terms such as "include," "including," and variations of
these are used in the present disclosure, these terms are intended
to be inclusive, in a manner similar to the way the term
"comprising" is used. Furthermore, the term "or" as used in the
present disclosure is intended to be not an exclusive
disjunction.
[0270] For example, in the present disclosure, when an article such
as "a," "an," and "the" in the English language is added by
translation, the present disclosure may include that a noun after
these articles is in a plural form.
[0271] Now, although the invention according to the present
disclosure has been described in detail above, it should be obvious
to a person skilled in the art that the invention according to the
present disclosure is by no means limited to the embodiments
described in the present disclosure. The invention according to the
present disclosure can be implemented with various corrections and
in various modifications, without departing from the spirit and
scope of the invention defined by the recitations of claims.
Consequently, the description of the present disclosure is provided
only for the purpose of explaining examples, and should by no means
be construed to limit the invention according to the present
disclosure in any way.
* * * * *